Semiconductor Components Industries, LLC

Sam J B W Vermeir

Brian K Blackburn

Benjamin M Rice

Wim Van De Maele

Frank J Kolanko

In one embodiment, a sequencing system includes a plurality of integrated circuits connected in a daisy chain arrangement, where each integrated circuit has an LED load connection. The system includes a diagnostic circuit which signals to the control unit that an open circuit condition has been detected, thereby turning off all LED loads.

Method of forming a sequencing system and structure therefor

A control circuit () for a brushless direct current (DC) motor () includes a current drive circuit (), a current loop regulator (), and a commutation loop regulator (). The current drive circuit () is adapted to drive the brushless DC motor () in a first polarity or a second polarity selectively in response to a control signal, and senses a current through the brushless DC motor () to provide a current sense signal. The current loop regulator () varies a duty cycle of the control signal to regulate the current in response to the current sense signal, and regulates the polarity of the current based on a state of a polarity signal. The commutation loop regulator () regulates a transition of said polarity signal in response to a comparison of a pre-commutation duty cycle value and a post-commutation duty cycle value.

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Hofstade, Belgium

Sam J B W Vermeir